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// libMeshb 7.5 basic example: read a quad mesh, split it into triangles
// and write the result back using fast block transfer
#include <stdio.h>
#include <stdlib.h>
#include <libmeshb7.h>
#ifdef PRINTF_INT64_MODIFIER
#define INT64_T_FMT "%" PRINTF_INT64_MODIFIER "d"
#else
# ifdef GMF_WINDOWS
# define INT64_T_FMT "%Id"
# else
# include <inttypes.h>
# define INT64_T_FMT "%" PRId64
# endif
#endif
int main()
{
int i, NmbVer, NmbQad, ver, dim, *RefTab, (*QadTab)[5], (*TriTab)[4];
//int TypTab[ GmfMaxTyp ], SizTab[ GmfMaxTyp ];
//void *BegTab[ GmfMaxTyp ], *EndTab[ GmfMaxTyp ];
int64_t InpMsh, OutMsh;
float (*VerTab)[3];
/*-----------------------------------*/
/* Open mesh file "quad.meshb" */
/*-----------------------------------*/
if(!(InpMsh = GmfOpenMesh("../sample_meshes/quad.meshb", GmfRead, &ver, &dim)))
return(1);
printf("InpMsh : idx = "INT64_T_FMT", version = %d, dimension = %d\n", InpMsh, ver, dim);
if(dim != 3)
exit(1);
// Read the number of vertices and allocate memory
NmbVer = (int)GmfStatKwd(InpMsh, GmfVertices);
printf("InpMsh : nmb vertices = %d\n", NmbVer);
VerTab = malloc((NmbVer+1) * 3 * sizeof(float));
RefTab = malloc((NmbVer+1) * sizeof(int));
// Read the number of quads and allocate memory
NmbQad = (int)GmfStatKwd(InpMsh, GmfQuadrilaterals);
printf("InpMsh : nmb quads = %d\n", NmbQad);
QadTab = malloc((NmbQad+1) * 5 * sizeof(int));
TriTab = malloc((NmbQad+1) * 2 * 4 * sizeof(int));
// Read the vertices: choose one of the four available methods
// First method: argument list with scalar pointers
GmfGetBlock(InpMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfFloat, &VerTab[1][0], &VerTab[ NmbVer ][0],
GmfFloat, &VerTab[1][1], &VerTab[ NmbVer ][1],
GmfFloat, &VerTab[1][2], &VerTab[ NmbVer ][2],
GmfInt, &RefTab[1], &RefTab[ NmbVer ] );
// 2nd method: argument list with vector pointers
/*GmfGetBlock(InpMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfFloatVec, 3, &VerTab[1][0], &VerTab[ NmbVer ][0],
GmfInt, &RefTab[1], &RefTab[ NmbVer ] );*/
// 3rd method: argument table with scalar pointers
/*TypTab[0] = GmfFloat;
BegTab[0] = (void *)&VerTab[ 1 ][0];
EndTab[0] = (void *)&VerTab[ NmbVer ][0];
TypTab[1] = GmfFloat;
BegTab[1] = (void *)&VerTab[ 1 ][1];
EndTab[1] = (void *)&VerTab[ NmbVer ][1];
TypTab[2] = GmfFloat;
BegTab[2] = (void *)&VerTab[ 1 ][2];
EndTab[2] = (void *)&VerTab[ NmbVer ][2];
TypTab[3] = GmfInt;
BegTab[3] = (void *)&RefTab[ 1 ];
EndTab[3] = (void *)&RefTab[ NmbVer ];
GmfGetBlock(InpMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfArgTab, TypTab, SizTab, BegTab, EndTab );*/
// 4th method: argument table with vector pointers
/*TypTab[0] = GmfFloatVec;
SizTab[0] = 3;
BegTab[0] = (void *)&VerTab[ 1 ][0];
EndTab[0] = (void *)&VerTab[ NmbVer ][0];
TypTab[1] = GmfInt;
BegTab[1] = (void *)&RefTab[ 1 ];
EndTab[1] = (void *)&RefTab[ NmbVer ];
GmfGetBlock(InpMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfArgTab, TypTab, SizTab, BegTab, EndTab );*/
// Read the quads
GmfGetBlock(InpMsh, GmfQuadrilaterals, 1, NmbQad, 0, NULL, NULL,
GmfIntVec, 5, &QadTab[1][0], &QadTab[ NmbQad ][0]);
// Close the quad mesh
GmfCloseMesh(InpMsh);
/*-----------------------------------*/
/* Create the triangluated mesh */
/*-----------------------------------*/
for(i=1;i<=NmbQad;i++)
{
TriTab[i*2-1][0] = QadTab[i][0];
TriTab[i*2-1][1] = QadTab[i][1];
TriTab[i*2-1][2] = QadTab[i][2];
TriTab[i*2-1][3] = QadTab[i][4];
TriTab[i*2][0] = QadTab[i][0];
TriTab[i*2][1] = QadTab[i][2];
TriTab[i*2][2] = QadTab[i][3];
TriTab[i*2][3] = QadTab[i][4];
}
/*-----------------------------------*/
/* Write the triangle mesh */
/*-----------------------------------*/
if(!(OutMsh = GmfOpenMesh("tri.meshb", GmfWrite, ver, dim)))
return(1);
// Write the vertices
GmfSetKwd(OutMsh, GmfVertices, NmbVer);
GmfSetBlock(OutMsh, GmfVertices, 1, NmbVer, 0, NULL, NULL,
GmfFloat, &VerTab[1][0], &VerTab[ NmbVer ][0],
GmfFloat, &VerTab[1][1], &VerTab[ NmbVer ][1],
GmfFloat, &VerTab[1][2], &VerTab[ NmbVer ][2],
GmfInt, &RefTab[1], &RefTab[ NmbVer ] );
// Write the triangles
GmfSetKwd(OutMsh, GmfTriangles, 2*NmbQad);
GmfSetBlock(OutMsh, GmfTriangles, 1, 2*NmbQad, 0, NULL, NULL,
GmfInt, &TriTab[1][0], &TriTab[ 2*NmbQad ][0],
GmfInt, &TriTab[1][1], &TriTab[ 2*NmbQad ][1],
GmfInt, &TriTab[1][2], &TriTab[ 2*NmbQad ][2],
GmfInt, &TriTab[1][3], &TriTab[ 2*NmbQad ][3] );
// Do not forget to close the mesh file
GmfCloseMesh(OutMsh);
printf("OutMsh : nmb triangles = %d\n", 2*NmbQad);
free(QadTab);
free(TriTab);
free(RefTab);
free(VerTab);
return(0);
}
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